SURVIVABLE IP OVER WDM: GUARANTEEING MINIMUM NETWORK BANDWIDTH

摘要

A novel survivable IP over WDM network design problem is proposed. The IP network uses lightpath services of the WDM network to implement its IP links. The WDM network can provide unprotected and protected lightpaths, as well as a new lightpath service referred to as survivable pair. The IP network must support two traffic matrices, one under normal conditions and the other whenever there is a failure. A mixed integer linear programming (MILP) formulation of the problem is presented. An example is given where the survivable pair service can lead to significantly lower costs, sometimes by at least 30%.